How do I bypass the heater on a 1990 mb 300ce

what does that mean?

defintly a valve,regulator or gas line leak,or injector leaking rail pressure

You mave have a leak if it blows cold and then hot if that's so there's low of freon

There are two hoses going to the core, those two hoses get removed from the heater and connected together....

by doing this your car would allways run bad, Because your ECM will not know what your doing and will be continusly running that code. Could be alot chepper in the long run just replace.

Fuel filter is by the fuel pumps under rear passenger side of car. There is a plastic cover there. Also Look into your coil being bad, also wires, plugs cap and rotor. Ignition issues also can be caused by the OVP relay, the box with a fuse in it by the battery.

Click on the following direct, free Link. It has several Belt Mark Diagrams for your 1990 Mercedes Benz 300 Class 3.0L V6. It also has additional - very helpful Instructional and Directional Diagrams.

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!


http://www.2carpros.com/car_repair_information/year/1990/make/mercedes-benz/model/300ce/1990_mercedes-benz_300ce_drive_belt_routing_diagram.htm

You need to use a bypass relay on this car. the car colours are - L/Ind = Black/White, R/Ind = Black/Green, Fog = Grey/Green, Brake = Black/Red, Left tail = Grey/Black, Right tail = Grey/Red

Take it back to the shop that did the work and have then to adust the rear band.

Either the sending unit,(this unit is on the motor)is malfunctioning, or your engine oil pump may not be providing enough pressure.
This could be due to sticky oil pressure bypass valve,,worn out pump,,or worn engine main bearings.
If it is just a case of worn engine oil bearings,this is usually indicated by high oil pressure when cold,,but low oil pressure when hot,.i wouldn't worry to much, since most engines suffer from this same complaint and doesn't harm the engine any.